The simple present tense is used to describe habits, general truths, repeated actions, and instructions. It is formed by using the base form of the verb except for the third person singular, which takes an -s ending. The simple present tense expresses things like habits, unchanging situations, general truths, fixed arrangements, and future time after conjunctions like after and when. It is not used to describe actions happening now. Examples are given for using the simple present tense to express habits, repeated actions, general truths, instructions, and fixed arrangements.